import { useState, useRef, useEffect } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import { Sparkles, Send, X, Lightbulb } from 'lucide-react';

interface AISuggestionBarProps {
  suggestions: string[];
  onSuggestionClick: (suggestion: string) => void;
  onSubmit: (text: string) => void;
  placeholder?: string;
}

export function AISuggestionBar({
  suggestions,
  onSuggestionClick,
  onSubmit,
  placeholder = "输入你的想法，或点击预设词条获取 AI 建议..."
}: AISuggestionBarProps) {
  const [inputText, setInputText] = useState('');
  const [isFocused, setIsFocused] = useState(false);
  const [showSuggestions, setShowSuggestions] = useState(false);
  const inputRef = useRef<HTMLTextAreaElement>(null);

  // 自动调整输入框高度
  useEffect(() => {
    if (inputRef.current) {
      inputRef.current.style.height = 'auto';
      inputRef.current.style.height = `${inputRef.current.scrollHeight}px`;
    }
  }, [inputText]);

  // 处理提交
  const handleSubmit = () => {
    if (inputText.trim()) {
      onSubmit(inputText.trim());
      setInputText('');
      if (inputRef.current) {
        inputRef.current.style.height = 'auto';
      }
    }
  };

  // 处理回车提交
  const handleKeyDown = (e: React.KeyboardEvent) => {
    if (e.key === 'Enter' && !e.shiftKey) {
      e.preventDefault();
      handleSubmit();
    }
  };

  return (
    <motion.div
      initial={{ y: 100, opacity: 0 }}
      animate={{ y: 0, opacity: 1 }}
      className="fixed bottom-0 left-0 right-0 z-50 bg-gradient-to-t from-[#0C0E11] via-[#0C0E11] to-transparent pb-8"
    >
      <div className="max-w-5xl mx-auto px-6">
        {/* 智能预设词条 */}
        <AnimatePresence>
          {showSuggestions && (
            <motion.div
              initial={{ height: 0, opacity: 0 }}
              animate={{ height: 'auto', opacity: 1 }}
              exit={{ height: 0, opacity: 0 }}
              className="mb-4 overflow-hidden bg-black/30"
            >
              <div className="flex items-center gap-3 mb-3">
                <Lightbulb className="w-4 h-4 text-yellow-500" />
                <span className="text-sm text-white/60">智能预设词条</span>
              </div>
              <div className="flex flex-wrap gap-2">
                {suggestions.map((suggestion, index) => (
                  <motion.button
                    key={suggestion}
                    initial={{ opacity: 0, scale: 0.8 }}
                    animate={{ 
                      opacity: 1, 
                      scale: 1,
                      transition: { delay: index * 0.1 }
                    }}
                    whileHover={{ scale: 1.05 }}
                    whileTap={{ scale: 0.95 }}
                    className="px-3 py-1.5 rounded-full bg-white/5 hover:bg-white/10 backdrop-blur-sm
                      text-sm text-white/70 hover:text-white transition-colors flex items-center gap-2"
                    onClick={() => onSuggestionClick(suggestion)}
                  >
                    <Sparkles className="w-3 h-3" />
                    {suggestion}
                  </motion.button>
                ))}
              </div>
            </motion.div>
          )}
        </AnimatePresence>

        {/* 输入区域 */}
        <div className={`
          relative rounded-xl bg-white/5 backdrop-blur-sm transition-all duration-300
          ${isFocused ? 'ring-2 ring-blue-500/50 bg-white/10' : 'hover:bg-white/[0.07]'}
        `}>
          <textarea
            ref={inputRef}
            value={inputText}
            onChange={(e) => setInputText(e.target.value)}
            onKeyDown={handleKeyDown}
            onFocus={() => {
              setIsFocused(true);
              setShowSuggestions(true);
            }}
            onBlur={() => { setIsFocused(false); setShowSuggestions(false) }}
            placeholder={placeholder}
            className="w-full resize-none bg-transparent border-none px-4 py-3 text-white placeholder:text-white/40
              focus:outline-none min-h-[52px] max-h-[150px] pr-[100px]"
            rows={1}
          />
          
          {/* 操作按钮 */}
          <div className="absolute right-2 top-1/2 -translate-y-1/2 flex items-center gap-2">
            <button
              className={`
                p-2 rounded-lg transition-colors
                ${showSuggestions ? 'bg-white/10 text-white' : 'text-white/40 hover:text-white/60'}
              `}
              onClick={() => setShowSuggestions(!showSuggestions)}
            >
              {showSuggestions ? <X className="w-5 h-5" /> : <Sparkles className="w-5 h-5" />}
            </button>
            <button
              className={`
                p-2 rounded-lg transition-colors
                ${inputText.trim() ? 'bg-blue-500 text-white' : 'bg-white/5 text-white/20'}
              `}
              onClick={handleSubmit}
              disabled={!inputText.trim()}
            >
              <Send className="w-5 h-5" />
            </button>
          </div>
        </div>
      </div>
    </motion.div>
  );
}